Yes. The penalty on line 38 IS INCLUDED in line 37 tax due. You can double check it. Line 37 should be line 24-33. Then add line 38. And It's very common and normal and expected for the IRS or state to bill you for more or send you a refund. You can even leave line 38 blank and let the IRS calculate it for you.
Sounds like you already filed. For the future…..
If Turbo Tax calculates a penalty on 1040 line 38…..You might be able to eliminate it or at least reduce it. You can go to Federal Taxes tab or Personal tab, under Other Tax Situations and select Start by the Underpayment Penalties. You will answer a series of questions that may reduce or eliminate the penalty. Or you can elect to have the IRS figure the penalty for you. It's form 2210.
It's under
Federal or Personal (for Home & Business Desktop)
Other Tax Situations
Additional Tax Payments
Underpayment Penalties - Click the Start or update button
